Well, in some European countries the drivers do not handle any cash or tickets. Both for safety reasons and for the fact that having a queue of people waiting t

Well, in some European countries the drivers do not handle any cash or tickets. Both for safety reasons and for the fact that having a queue of people waiting to buy tickets from a single driver introduces latency. Instead, there's a ticket machine on the bus stop, or sometimes inside the bus. Alternatively you can buy a ticket using a mobile app. This means you can board without a ticket. Then ticket inspectors randomly board vehicles to check peoples tickets.